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Variation of Organic Matter Decomposition in Constructed Wetlands with Enhancing Aeration


Affiliations
1 College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, China
2 Drainage Engineering Technology Research Center of Tangshan City, Tangshan, China
 

Two different constructed wetlands were applied to remove organic matter of micro-polluted wastewater from a wastewater treatment plant. In this research, organic matter removal showed a favourable effect in two constructed wetlands. Moreover, the aeration device added to the wetlands’ bottom could obviously increase the removal rates of chemical oxygen demand (COD) in micro-polluted wastewater under this operational condition. In addition, the optimal operational condition for COD removal was evaluated by three dimensional (2D and 3D) contour plots while the bottom aeration device was added. The results showed that in horizontal zeolite subsurface constructed wetland (HZSW), the optimal removal rates of COD, which could reach above 95.56%, were obtained when the average daily aeration time was about 17~21h and hydraulic loadings were 0.16~0.24m3/(m2·d). In contrast, in horizontal limestone subsurface constructed wetland (HLSW), the optimal removal rates of COD, namely, 93.54~94.95%, could be obtained when the average daily aeration time was more than 16h and hydraulic loadings were about 0.13~0.32m3/(m2·d). In summary, the removal effects of COD increased obviously after the bottom aeration device was added in the two constructed wetlands.

Keywords

Constructed Wetland, Bottom Aeration, Organic Matter Decomposition, Hydraulic Loading.
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  • Variation of Organic Matter Decomposition in Constructed Wetlands with Enhancing Aeration

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Authors

Hao Wang
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, China
Huiyuan Zhong
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, China
Yang Tian
Drainage Engineering Technology Research Center of Tangshan City, Tangshan, China
Jiansong Zhang
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, China
Huan Lu
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, China

Abstract


Two different constructed wetlands were applied to remove organic matter of micro-polluted wastewater from a wastewater treatment plant. In this research, organic matter removal showed a favourable effect in two constructed wetlands. Moreover, the aeration device added to the wetlands’ bottom could obviously increase the removal rates of chemical oxygen demand (COD) in micro-polluted wastewater under this operational condition. In addition, the optimal operational condition for COD removal was evaluated by three dimensional (2D and 3D) contour plots while the bottom aeration device was added. The results showed that in horizontal zeolite subsurface constructed wetland (HZSW), the optimal removal rates of COD, which could reach above 95.56%, were obtained when the average daily aeration time was about 17~21h and hydraulic loadings were 0.16~0.24m3/(m2·d). In contrast, in horizontal limestone subsurface constructed wetland (HLSW), the optimal removal rates of COD, namely, 93.54~94.95%, could be obtained when the average daily aeration time was more than 16h and hydraulic loadings were about 0.13~0.32m3/(m2·d). In summary, the removal effects of COD increased obviously after the bottom aeration device was added in the two constructed wetlands.

Keywords


Constructed Wetland, Bottom Aeration, Organic Matter Decomposition, Hydraulic Loading.

References